1. Scene.add
// By default, when we call function scene.add(), it adds the cube to the to the coordinates (0,0,0). 
// This causes both the cube and the camera to be inside each other. 
// To avoid this situation, we need to set the camera position before rendering the scene.
// camera.position.z = 1000;
2. Sphere
// The sphere is created using THREE.SphereGeometry. 
// The first parameter is the radius, 
// and the second and third parameter is the number of width and height segments. 
// The sphere is drawn as a polygon mesh, and by adding more segments 
// it will be less "blocky" - and take more time to render.
3. Scale
// It is better to apply scale with full 3 same parameters 
// If you want to scale in one direction, using ApplyMatrix to geometry
// to move the position (matrix(0, height/2,0) to scale y
